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https://issues.apache.org/jira/browse/HDFS-9612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082241#comment-15082241
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Kai Zheng commented on HDFS-9612:
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Oh, the patch is rather messy. You need to update to the latest trunk and
rebase your work. The work itself looks good, though. Thanks Wei chiu!
> DistCp worker threads are not terminated after jobs are done.
> -------------------------------------------------------------
>
> Key: HDFS-9612
> URL: https://issues.apache.org/jira/browse/HDFS-9612
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: distcp
> Affects Versions: 2.8.0
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HDFS-9612.001.patch
>
>
> In HADOOP-11827, a producer-consumer style thread pool was introduced to
> parallelize the task of listing files/directories.
> We have a use case where a distcp job is run during the commit phase of a MR2
> job. However, it was found distcp does not terminate ProducerConsumer thread
> pools properly. Because threads are not terminated, those MR2 jobs never
> finish.
> In a more typical use case where distcp is run as a standalone job, those
> threads are terminated forcefully when the java process is terminated. So
> these leaked threads did not become a problem.
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